Batman's secret hideout has been discovered using the magic of the internet, and surprisingly it's not under Wayne Manor. No, it's located on a US military base in Okinawa. Who'd have thunk?
Why does this building sport the Batman insignia? Says one Reddit user, "There are two squadrons of [F15s] here on Okinawa, the bats, which sport blue tail flashes, and the cocks, which sport red tail flashes." That sounds perfectly logical. Perhaps a little too logical. I'm inclined to believe that that hangar hides a device more along these lines...
And here's an in-depth look at the, uh, real Batcave.